Abstract : The advent of Air Force missile operations at South Vandenberg brought the need for prediction of hazards involved in nonroutine circumstances. The purpose of the study was to determine an empirical diffusion equation for South Vandenberg. The scope of the operation included (1) tracer releases from two sites near two launch points and collection of diffusion and meteorological data over South Vandenberg; (2) reduction and analysis of diffusion and meteorological data for South Vandenberg. Beyond this, the analysis yielded additional information on trajectories and WIND system station suitability. (Author)